Osmia (Diceratosmia) spinulifera, Griswold & Rightmyer, 2017

Rightmyer, Molly G., 2017, A revision of the subgenus Osmia (Diceratosmia), with descriptions of four new species (Hymenoptera, Megachilidae), Zootaxa 4337 (1), pp. 1-37 : 20-21

Osmia (Diceratosmia) spinulifera new species

( Figs 3A , 5B , 11A )

Diagnosis. Female O. spinulifera share with O. aliciae and O. gonzalezi the distinctive erect, modified hairs of the clypeus and frons, and the shagreened, sparsely punctate frons ( Figs 2B, 2C ) that distinguish them from all other Osmia . This group also differs from other Diceratosmia in the acutely angled apex of the forebasitarsus. From O. aliciae and O. gonzalezi it can be distinguished by the shiny rather than dull clypeus ( Fig. 5B vs Fig. 5A ) and spiracle on T1 surmounted by an acute angle ( Fig. 3A vs Fig. 3B ). The male is unknown.

Description. Female. Total length: ca. 9 mm; forewing length: 6.5 mm; distance between lateral ocellus and preoccipital margin: 0.5 mm; distance between lateral ocellus and compound eye: 0.5 mm.

Color: Head and dorsum of mesosoma blue-green, mesosoma laterally blue, metasoma green, except with brown integument on mouthparts, labrum, apical edge of clypeus, antenna, posterior half of tegula, tibiae, tarsi, inner surfaces of femora; dark brown with green overtones on mandible basally; brown with strong purple overtones on outer surfaces of tibiae. Hindtibial spurs yellow. Wings moderately infuscate.

Pubescence: White, plumose hairs on body except minutely branched on outer surfaces of mid and hind legs, tergal marginal fringes, fringe of S6; golden to pale golden on mandible, face; stouter golden hairs on inner surfaces of all tarsi. Labrum with erect golden apical fringe and transverse fringe medially. Hairs of clypeus and frons mostly hooked apically. Scopal hairs brilliant white; S6 with short, moderately dense, suberect, white hairs.

Punctation: Head with punctures ovate to circular, contiguous or nearly so and deeply impressed except as follows: labrum mostly impunctate on basal half; clypeus with apical truncation narrowly impunctate apically (ca. puncture width); paraocular area dorsally with punctures less strongly impressed. Frons sparsely punctate with integument between punctures strongly granulose, much duller than integument on remainder of face including clypeus. Mesosoma with punctures round, nearly contiguous, deeply impressed except as follows: mesoscutum with punctures extremely dense, causing integument to appear roughened and dull on anterior half, punctures much finer anteriorly, especially medially; tegula with punctures minute, most dense anteriorly, nearly absent centrally; mesepisternum and metepisternum with punctures separated by up to 0.5 puncture diameter in places, with one to three micropunctures between larger punctures; metanotum and lateral and posterior surfaces of propodeum with punctures separated by up to two puncture diameters, with background integument weakly shagreened to granulose, duller than mesepisternum and scutellum; propodeal triangle moderately lineolate to reticulate on dorsal half with some strong rugulae basally, shagreened on lower half; legs with punctures on outer surfaces fine, more irregular, more weakly impressed, with inner surfaces of trochanters, femora, and fore- and midtibiae shinyto weakly shagreened, with scattered smaller punctures. T1 with anterior, lateral surfaces polished, shiny, almost impunctate; terga with dorsal surfaces between punctures shiny; punctures round, well impressed, nearly contiguous; punctures denser, smaller along apical margins of all terga (usually obscured by dense hair fringes). S2–S5 with coarse, dense punctures, S6 rather finely punctate.

Structure: Maxillary palpus five-segmented, fifth segment minute; labial palpus with second segment ca. 1.5x longer than basal segment. Mandible with condylar ridge thicker than outer ridge, these ridges parallel along most of length; apical margin apparently with three teeth (mandible somewhat worn), third tooth not evident; inner, ventral margin of mandible lacking distinct tooth, distinctly carinate for apical two-thirds, diverging well away from condylar ridge towards inner, dorsal margin of mandible; mandible apically widened (1.7 times wider than median width), first tooth length much longer than second, second tooth located midway between first and fourth tooth. Clypeus gently but distinctly convex, apical margin forming distinct straight truncation, not scoop-shaped in oblique view, in anterior view margin very weakly concave, and forming ca. 130 degree angle with lateral apical margin of clypeus. F1 almost twice as long as F2 length, remaining flagellar segments gradually increasing in length such that F10 twice as long as F1. Vertex behind lateral ocellus ca. 3.1 OD in length. Genal width ca. 1.4 times compound eye width in lateral view. Preoccipital margin rounded, not carinate. Hypostomal carina moderate throughout, not highest at midpoint of hypostomal area posterior to angle, slightly lower at angle. Mesepisternum with anterior face at right angle to lateral face but omaulus not carinate. Scutellum gently biconvex on anterior margin. Axilla gently convex laterally. Malus forming short, pointed apical spine, this spine minutely pectinate on inner margin. Fore basitarsus acutely angled apically; second and third foretarsi with lobes strongly swollen, anterior lobes much longer than posterior. Hindtibial spurs more or less straight along length, only very weakly curved on apical sixth, outer spur about one sixth shorter than inner. Hind basitarsus with lateral margins slightly convex, widest before midpoint. T1 anterior and dorsal surfaces separated by weak carina; T1 spiracle surmounted by acute angle ( Fig. 3A ). S6 with apical margin slightly, roundly angled medially.

Male. Unknown.

Distribution. Known only from the state of Coahuila, Mexico ( Fig. 18 ).

Floral Associations. None.

Holotype female. “ ECOAB.67357 Méx., Coah., Arteaga C. Art. -Carbo., 1936 m 25,46 N, 100,75 W 30/7/ 2013, 09L40, Col. Jorge Mérida // HOLOTYPE Osmia spinulifera Griswold & Rightmyer ♀ HOLO 78 [red label]” ( SAN CRISTÓBAL DE LAS CASAS).

Etymology. The name comes from the Latin spinula, small thorn, and the suffix –fer, to bear or carry, in reference to the small pointed projection that partially covers the spiracle on the first metasomal tergum.

Figures

FIGURE 2. Female faces: A) O. marilaunidii (DRO 4915), B) O. aliciae (BBSL 204540), C) O. gonzalezi (BBSL 204546), D) O. conjuncta (BBSL 695035). Scale bar = 0.5 mm.

FIGURE 3. Female T 1 lateral view showing spike over spiracle: A) present, O. spinulifera (HOLO 78), B) absent, O. gonzalezi (BBSL 204543). Scale bar = 0.5 mm.

FIGURE 5. Female clypeus in anterior view: A) O. gonzalezi (BBSL 204546), B) O. spinulifera (HOLO 78). Scale bar = 0.25 mm.

FIGURE 11. Female habitus lateral view: A) O. spinulifera (HOLO 78), B) O. stangei (BBSL 989171). Scale bar = 0.5 mm.

FIGURE 18. Known distributions of O. conjunctoides (green triangles), O. exquisita (white circles), O. gonzalezi (red circles), O. lacunosa (yellow circles), O. spinulifera (blue circles), and O. stangei (purple triangles). Scale bar = 200 km.